The bicycle is the most efficient form of transportation ever devised, and it delivers a whole-body workout. Cycling consumes far fewer calories per mile traveled than cars, buses, or even walking. It is sometimes the fastest way to get around a city. Cyclists can zip around traffic jams and don't have to fight for a parking spot because they can bring the vehicle home -- maybe. Many homes aren't bicycle-friendly, so bikes are either not used or not purchased. Instead, try altering your home to accommodate biking or altering your bike to accommodate your home.